Aptitude - Probability
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- Probability - Formulas
- Probability - General Questions
Here, S = {1, 2, 3, 4, ...., 19, 20}.
Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.
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n(E) | = | 9 | . |
n(S) | 20 |
Total number of balls = (2 + 3 + 2) = 7.
Let S be the sample space.
Then, n(S) | = Number of ways of drawing 2 balls out of 7 | |||
= 7C2 ` | ||||
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= 21. |
Let E = Event of drawing 2 balls, none of which is blue.
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= Number of ways of drawing 2 balls out of (2 + 3) balls. | |||
= 5C2 | ||||
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= 10. |
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n(E) | = | 10 | . |
n(S) | 21 |
Total number of balls = (8 + 7 + 6) = 21.
Let E | = event that the ball drawn is neither red nor green |
= event that the ball drawn is blue. |
n(E) = 7.
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n(E) | = | 7 | = | 1 | . |
n(S) | 21 | 3 |
In two throws of a dice, n(S) = (6 x 6) = 36.
Let E = event of getting a sum ={(3, 6), (4, 5), (5, 4), (6, 3)}.
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n(E) | = | 4 | = | 1 | . |
n(S) | 36 | 9 |
Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}
Let E = event of getting at most two heads.
Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}.
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n(E) | = | 7 | . |
n(S) | 8 |